The evil Diana Marvin, aka Kathy
Diana Marvin, aka Kathy (Kathleen Robertson), is the main villainess from "Ghost in the Machine," episode 3.05 of Medium (airdate December 6, 2006).
Diana Marvin is the mistress of Sean Caffey, with their affair lasting an undisclosed number of months. Despite their affair, Sean couldn't leave his wife, Maggie Caffey, as a prenuptial agreement stated that he would be left penniless if he filed for divorce. Knowing this, Diana plotted to have Maggie killed, most likely so she and Sean could be together and she could live off his wealth. Her sinister plot involved approaching Travis McQueen, an Army sharpshooter, and seducing him into believing that she was in an abusive relationship.
After showing a bruise on her person, Diana (who was going by the name Kathy) suggested to Travis that they should kill her abusive lover, and she later took Travis out on the road to describe her lover's driving route and habits. In actuality, the habits belonged to Maggie, and under Diana's orders, Travis shot at the targeted car and killed Maggie, leaving Travis panicked that he killed the wrong person. In response to Travis' worries, the evil Diana suggested that Travis was suicidal, right before she shot and killed her co-conspirator to portray him as such.
The villainess later returned Travis' video camera (which he had been recording her on) to an electronics store, where Allison DuBois later bought the same camera as a birthday gift for Joe. She would later see the video images of Kathy and Travis, which ended up leading to a club which Maggie was a part of, where Allison encountered "Kathy" working as a waitress under her real name, Diana. After seeing the image of Diana killing Travis, as well as Lee Scanlon informing her about Travis' death, Allison, Scanlon, and Manuel Devalos interrogated Diana, who revealed her affair with Sean, while dismissing the concept of Sean killing his wife.
When the suspicion was pointed towards Diana, the villainess denied the claims, but at that moment, the salesman from the electronics store appeared and confirmed that Kathy/Diana had returned the camera using Travis' credit card. In addition, the salesman confirmed that he sold the same camera to Allison, and his statements resulted in Diana's arrest.
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| Kathleen Robertson |
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| Diana Marvin | Azkadelia | Kayla Pennington | Helen Mitchell | Erin Laswell |